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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a856e89fdae578a95b7fa3b71b5d130b89a5cd917ef37901d4088ab7ae5b23' 
  AND token = '2GMzOK9YuotqteAhDnaN3XRu2hphAIAtCJmy5/rT5lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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