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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abce60a35a7a8ef77e7097c0a97df74fe2e0207ca3b2e346e7639853bc52e2a6' 
  AND token = 'ebd5HfNtTtQdK6pJsksI5c8a3kYRTd4YhXI6ZYoTAIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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