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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808574e434459064aa0716a08d63922e4a49d37155b81cdeb843d61f7e7ca7a3' 
  AND token = 'dzVyVRp+dkgqNoImy3FtmCyyWmbNRDs947t1rb2vogQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}