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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cd6f5e6d1e30a2c2ea1eea9c48454c905ecf1905ed03d2bd41ec9f3c920534' 
  AND token = 'sVmZ2G+uv3nhcF4cLpFPxJQ7IH0iNjdzDVYtgqkc/xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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