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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a711b0231b6c980ceaea328f4fa86928d40140c1c53b2eb7b22d6dc7a65e412b' 
  AND token = 'gzH3xaGdpH/GYb8NZAwrQx/gy/JMiQ+kDWfne0aBS/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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