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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db35e59f69119257bbc39baad7c73b8d8840d9fd38419263355298b68a8ee694' 
  AND token = 'aQ7IedPu6a415TFId/HSy6Nz0rU7nZlO7s/7Ku4PNRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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