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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d40364793cc3fadb4040551496a1f1f5b81b3a94743f18c37fa263af5528941' 
  AND token = 'm9By2zAKib4wnSXdaAHfxjfBwCNEdm7qrouf2kP+DXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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