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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5b3d7d287f05515fa8b2dd92dd2b02a5997a14dfcb505903074cbaad63964f' 
  AND token = 'q/mbBnfZeoSv6N8L96/kp1qR/uwMoX3wWL4BByi6eJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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