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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e464f6684a464a59babd3e21e62700826f59b943d56388cda6082206776fc1' 
  AND token = 'n+hl6b+WXItdeCntIWGbRT6O1YDkAQujtChUYEEIM34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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