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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fb742f03264c54ab1420377ddea7001d5bfd5ea1f862e0393df63ac130c290' 
  AND token = 'hYp5mdoJGGJ111m8/dgnE2CbfUo7Y3+2AemrVRo1rEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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