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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1925632d197b0976487a37b20787f11c0e6ad9438f6e9af48600762a72ca8e5a' 
  AND token = 'u4oNtV1x/pwLPFXcSOt4lyjfxSyS3CbQY6731JA6LZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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