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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40a8b2191981b693089984f9be41f027e0ba284451e396ea41744783873bb92' 
  AND token = 'nGsVX9+CnXyig8YvWBMK1bInqI+U5QpPy5vXGov2lQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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