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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a14b7276440c7d99f6a8763780b5436ca5798ec2d11db38cc19db35f86ac74' 
  AND token = '5xNFB5RV3Pug+aaFrFVnxgijWV327uh2jhwEP3167X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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