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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e787530c3a626d88d89e09c8c089ea06da1fa5768ce3ffe36f344440f0c0d7' 
  AND token = 'uWtM6Jhojwlt7gr92WEGjWrWvTzMSJckCZAYqIWagiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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