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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce946e98c361245754af0f6f3d63fc5953b74c20400c86818884b61c2c271a9' 
  AND token = 'rEx7Sl5Ghj4hAB0jZlcIYktbDEdm629MktWvLvj21xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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