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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e28fc1b7c1dd3edd08e077394c85acf5f1d3c650f4cdc3b72494fb58c7bb998' 
  AND token = '36pF0MHkSlwxZtpulIwoMpqCRtach5wlFe3Fze5BMsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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