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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f1b8ff987bdc1fb71fb04561b4eb9ed6df01671f31dd81f8f12e4ecc191c57' 
  AND token = '8ZT3cUaU9TjB2dj+eDcy+YpPNmfOIJ2w3MRC5Qt6Tas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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