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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcf6637e166a5f97a9a6f1b4ade3d3e54c85ac4d5e9886df80a89a1531f719b' 
  AND token = '4pOpLSA8lxQTieqfAYizm9shyh3c29Vwq9gsJwqtULE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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