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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf339f4bb1a63afaf0abaec2045c63a3032f534c96254e405b3fe375ff0969d4' 
  AND token = 'L4ZeKJxBFNyFVUHR/B4JpSkft5XDsdhKVl/M2Iyw1ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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