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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b04d61e09186f4733e33cfa4c4943bf38b895b923406efc8e42961df7439e00' 
  AND token = 'Q7oGUQm88lPoJZ+6Q8DzhTWPD6oYQd9/dFa6eqCKhX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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