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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7f931f465bd2c5455e545ca2da370517a056c259671a3fca2b59afa67c3b71' 
  AND token = 'jm2uhxmOdSfsG3Ppccb15Y6njfUlQwcIJLgnR/1/Gmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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