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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0339e0e30ccd19517a1914329deb14caee3d7a879d7d458e71521e7a17fe64' 
  AND token = 'wg13ImVtdW0OTHor1yrNgHWvGtJtKr/6EyKj3tG20XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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