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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1a9d09686538eb6ca8d6932f8a6a316399d21253d9029ccb0ad80c2472b252' 
  AND token = 'kJgAKE2GKX9zsvBhlWfwXx6KC38de0qsdMm/0gunYlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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