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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bda02f1637a4c464ed64d9354c35b8947440e1e730806c12b5e844d7d3f3bc' 
  AND token = 'zfx0OpIN5ye+evA4hIPZMnmkBisqElSl6HbgZzJIr28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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