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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4877c5b67b855c38cda95748c9abf657ee9e3b3d700ef8bb423a6692aabf9462' 
  AND token = 'itQRcbyfxSQ7YtUeTuAKgdoNpC8G1tzmrFhBxHOZEjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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