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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4efecaa2c0981c92fbf023041050cad28f35341a46074699f40507622ff7c60' 
  AND token = 'YbzVviQVBZqNOCNn05RoDPPkogTQlspzeSUXOLQPg+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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