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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886418937b3590eb9d889c71585dbd78c9495d6c176cb434a8a548e023f30cbc' 
  AND token = 'GX5rYuuYKCnLQdZSdTyL/OcRKKxb2A6qjBy6Pf1rRvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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