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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f753db44c9dc8d67bb107c25364b13c9ebe60fd9be7070e4fdf41796003374' 
  AND token = 'mojrvRDs+f4JyZevnRbHXNmyUCkFmdQ9zl0M73JWxsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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