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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d267b3e23a1eceb68829dd1a8e58a98d38e7a2dff27aee9247a4395d72cfd57' 
  AND token = 'j6qnHSYUZXG2vIU4a1FIZbzDIgIMjkewZSBvo8lqnZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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