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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a505d087b9a35837bc6d22fabfad35151c8f348001e51f8b367bd669b5a10ee' 
  AND token = 'mrzBtDp0vxXUIKlG5TMcHOBDuPOQg0MFITqY12IAhM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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