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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865a73eb70d0aaa91e9bbeee0017f0d2fd802b69944ab14913f16001d058bca4' 
  AND token = 'ATUAXv9tLECy+UfG0FBVAD34h/V27Ra5GvSIQ5wu/6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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