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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5b0e94ffd1ba5b81e5cc3933ee0bc979c4b0114514b35c0ddf6166fd65a62b' 
  AND token = 'v7o2UnjAiGDYy21l99HhSfjfaixCtyn+uoFinzNbrzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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