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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26565fe3071da00b8b3138ab192cf636feea0a5844d7d7c7c580e3f11305fd8' 
  AND token = 'NlJDuFHJptf1TzT7aW6Qr6Mzr/fH+lPJ1YTJO8mwCVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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