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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a332e27822d5507e40bb61bb281b4c69614582900f4d749a10898383e5ba394' 
  AND token = '7o85isCzQ09Nonjowpa5EnnqO9NyQXARcf8voFypC+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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