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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1e0d9eb8cb64c2741ff0cb28aab4bdd8043756eec81e89e9e08eaa195d7b1f' 
  AND token = 'ywA25Kw7VntHX9yA4ffBp5wDPNWYZq44RU10Oc2uxto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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