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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf1137055a985bb820f0b8337476929df710b451a1dffd0fa61f4256f5f77a5' 
  AND token = 'lgUeOcL+ArGaAJkFpim0b+7P33PIEAR9ih7moVIJPkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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