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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f53affd1c39d31caad33e3252242bf53fd229df6ca8af9b8c799585eaaabcc' 
  AND token = 'UdS8knVv8CeLO/gdjgPuSJ37z5d0KigwxEKJu6in0Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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