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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806ae7204c8ea42bcaaa84c40a5a5eb0a187a5d8789cc7ac0fe289241baab2f9' 
  AND token = '/4O5+IvcPM9YSIhFugL95biuoPUWTgAGWDOt3MMmRh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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