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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dfec80c921ea78a3ee3f3c625ad4d02232ea3f80e0102535199b13f25d3d28' 
  AND token = 'qWzk3gZhUidcHGpj+DGf6kPzEW8dE9Fv8IF2a+v4dx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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