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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1462bb474409ee13894e53e4ee7371cf8e8aab9d1eb96234be34ba85d8555fc4' 
  AND token = 'f93pl/6wJ+R4vlEsoHYu+obtkvifeWRHMKpJRSd37c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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