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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c2bd8c2d570c5816864a58928194ead9ad2288723f521969e456a9b8276f6e' 
  AND token = 'o905MPgMES3uRliNwa6proaiDj/mDPurlJ02M4yW8QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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