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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20445617eedad41b8f3d1e9243814b3712fb6ee1d12679e59cfe0ca9679768ce' 
  AND token = '+EGbABK6hMFQ3y/0VvMeUr/pLfeZ425VCqo6AHwIywQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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