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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e4ed39c502bd663f9d4b61ad5b34f3f55ee2da175e7762342398b08399e174' 
  AND token = 'm3FPTYlKrSKFEj4EhrDCcCIwYWtGI62nPex1qAs878E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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