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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426973f11bd0b857e928c479c2f1dfe96d5c49df1bc12ff7edc67d4d4890afa1' 
  AND token = 'iXDBD7NiEl/FZ3JmumgJb4mSDYlBP7fcJv8jTA9ZnZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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