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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79583f72992f86e52b39e429b49cc772071e32f0faa3e24d5729a9267bf52e3' 
  AND token = 'mgIpVLNblvsqOiLzkFum36DEBrL4aO75T/9uGbT4W6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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