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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e0f0636357d9c3c29a4e548a79787a876fde254d90c03f79bd07b2fa1014cf' 
  AND token = '3mrtAQKo5iaewsXt85zSQ0SqU0PmYOO9M5DKtceZ2sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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