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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547c51342560d73ef75002be07f27a969650660a49e29ce6528752d79d2d5f29' 
  AND token = '83WhIBP11VVOVG46SBQP0FcCt5xnAw1Lo3nwnXQ8zBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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