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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978ae9ddbcad009b56ac653e22efc679126423d3dc8f7a8ff183e4109ab9f2db' 
  AND token = 'gHefWYxBsHHmuBAu+Zph+T9pQpHkxqEus1pa6s5zcmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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