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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd811ba9956c283c5e368b5a570c35edbd91c492e6779de8b5af96eca701424be' 
  AND token = 'iIySiYByTmOp+PPUc9jxVYGl43h9d8SZz9u73fkjDxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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