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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c99b1cc525f1a26baf17cfab959c9cda5835daf17d26d58f24f11d659343b9' 
  AND token = 'vmtVi98XSdV5j6f7Tg3Z4zj39X7o96ATZqqZbh2Gus4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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