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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7510d564596a1d99b66f0b69ae3691b55a0db8763954fc1310affc327e83ef' 
  AND token = 'epKh65XSpuE+7XGctQio8qtY8i3xwJ7zed9lcRfswRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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