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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793abc383da771faaa9f75c9bf8cde0282c51400a89891d2acaabe25a475e4af' 
  AND token = 'EdS1h6eWdFrMFYNuNtJMPPkQKvGgjCzBXx2cE/4d3Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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