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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1bd5e85c1735b558331b7b3eb240886703b96b31445f9acbbb5527f3ce19f7' 
  AND token = 'SYhlt3TAVukv44qIzEmlPO4SHEmuWn3hdB09YjJkA/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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