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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7a38f7dceb87e5b97d60141da6af256e6ecc1a10bd623636303bf436a62b74' 
  AND token = 'GcD7NX7aSGboMNTI3yxGa6RWEhYXM3C8KUEijQMm+EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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