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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e91f7fe186a3349b0fe37ba63ba403fe719289807740f2b4c915ead9d1ea4d' 
  AND token = 'ukTAeKXGuxzIjLfDsBrFH6rZzK9cSPuWe3wfrTEi5Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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