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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cf427c7df6443225f29d5244d600b7ebec889b11162a4f3dc864194ac22973' 
  AND token = '406jfxuNDu/wG9kMPAIgXWp5/gjLWfVGK8x7Cse1I7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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