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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26cb9d95354ec8b3a1674dd3911a00885580b4ec594a499e8524a1f7204db81' 
  AND token = '47QxnTnj8p4DJbyTYknu0vh7W8cVTyMj+5dTvGUzCn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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