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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f6b75f00f822108da25ce9b0f19312ba605437b875eb34d994f755380567b0' 
  AND token = '9EJ1hVJvcMbM0PEj7ZWxnkdEGpmtlbjWNzqM0HjmeXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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