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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b8e98a72e3b97d1a6f23d080562c24c74c4c8eec6fd5e136f6bf45acc4a411' 
  AND token = 'TDLKJN53rJiTe09bdQaQLc7sANPOaxglXN18MQ1BYvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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