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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff50917d6d9866da193ede689da12a45a44e6179c0c488d37385dcd228175eed' 
  AND token = '6Y2JtYOsh2yzCEa/KrK73CuO7BM17dNpZLz7iAFqHp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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