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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b6f5d72b8ac89150be850629d673b7f544d4fd6a530a1c6401b7d0461c3be3' 
  AND token = 'vmQ4q+w0s2WPPoc3+djsWXSZBsEHuPGEHkfMcQwDOBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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