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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd18280a096d71edb50c7737b213cf99a8017bb79b8bbf8f1adb59ab7167867e' 
  AND token = 'EbuJ1hzSO6Nhq8RvXXsxyKMuckCu7B2/MXi//APg4qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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