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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5b13add745e08b30d173baa5bb5014a6f1570ef6ea76f600d4690564f2cc10' 
  AND token = 'xLSztmVI5nOV53wSpa+yzBf1+5y/DpjqJNNME0g+jSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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