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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f717cc7f74c7bf0a76b787f865f0e2a9f9353b35c2e4343b9d78d5b8b5a8ff' 
  AND token = 'EWDdidc1a9dhuMk6041CmSz0ZIsLvegu5HZUTM3fSz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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