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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c35606e8efc48db75c9337a209e77e0e635cf0b4f583b9efcd1df59e68f6c1' 
  AND token = 'mrRBmW7t3SpfSYF/vomkEv0cicAkPsJdO1rS8fCva+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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