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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79b5bb92260426c5e627926da0e5af023cb5841b9bb86154016a9c1e5009e14' 
  AND token = 'AfJOXixKhIEmbj3i5sDpoNtTNaI533nNP6qUl2fft3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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