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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fd651506d24c452c1ce085ad108472d6e830ff3a3d253051a7d01dcbe12b12' 
  AND token = 'SCaW002hOOlUhgSR0VCmYJeA7aVIMlf0D2JquApFQu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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