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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6be155a0f1b1b33a4b6e4451733ba6f9ef3dd1c0c0bf22c9e96ff6045d2a2b' 
  AND token = 'l/6dhKRMLDEAfr+gxJfgrHVvtS25JqdQCrOLgfKGIvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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