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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560210f011f70e53f0cdac0de0069ebd04d6d233c72ca93f0ceeb83d406ac9ee' 
  AND token = 'gHbn1dthHgZ4G1yGoPaoIcmLIm7mYyPm/IE2NB+9gh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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